It appears that an .htaccess file in the forum/images folder is missing. Should there be one there? What should be in that .htaccess file?
Getting this 403 error when a forum image file direct access is attempted:
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You don't have permission to access /forum/images/general/ubb/nonewfolder.gif on this server.
Server unable to read htaccess file, denying access to be safe
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